One punch on the head and he died: there are generally three explanations.
( 1)
In the dream, you symbolize a part of your own personality. Doing sand is to correct shortcomings and eliminate personality defects. Death means that part is over, thus shaping a brand-new self.
(2)
The head symbolizes thoughts, understanding and opinions. Your brain is missing, which may reflect the influence of your friends on your mind.
(3)
A strong dream may also mean that the dreamer's mind has been hurt.
Generally speaking, the dream of death generally implies the end of a chapter in life, the coming of change and the beginning of a new era. This is a good dream. Good luck!